Ceratospyris mystax, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 6.
Shell elliptical spinulate, with slight collar stricture and large subregular circular pores. Basal plate with three pores (?) Horn small conical, oblique, shorter than the shell. Feet slender conical, longer than the shell, slightly curved, divergent. At the base of the columella, between the two feet, a small rudiment of the last caudal foot is visible.
Dimensions.—Shell 0.06 long, 0.1 broad; horn 0.02, feet 0.12 long.
Habitat.—Fossil in Barbados.
3. Dipospyris cubus, n. sp. (Pl. [83], fig. 18).
Shell box-shaped, subcubical, papillate, without external sagittal stricture, with numerous subregular circular pores. Basal plate with three very large collar pores, surrounded by a circle of smaller pores. Apical horn short and thick, scarcely half as long as the shell. Feet of the same form, longer than the shell, widely divergent.
Dimensions.—Shell 0.08 long, 0.11 broad; horn 0.03 long, feet 0.14 long.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
4. Dipospyris chelifer, n. sp. (Pl. [85], fig. 3).
Shell elliptical, compressed, nodose, with deep sagittal stricture and irregular roundish pores. Basal plate with three pores (?). Apical horn stout, conical, twice to four times as long as the shell (often much longer than in the figured specimen). Feet scarcely longer then the shell, cylindrical, slightly curved towards one another.